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drm/i915/vma: Move the bind_count vs pin_count assertion to a helper 

To spare ourselves a long line later, refactor the repeated check of
bind_count vs pin_count to a helper.

v2: Fix up the commentary!

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180605094107.31367-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-06-05 10:41:07 +01:00
parent 744799850e
commit 83d317adfb
1 changed files with 14 additions and 2 deletions
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16
drivers/gpu/drm/i915/i915_vma.c
View File

@ -459,6 +459,18 @@ bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
return true;
}
static void assert_bind_count(const struct drm_i915_gem_object *obj)
{
/*
* Combine the assertion that the object is bound and that we have
* pinned its pages. But we should never have bound the object
* more than we have pinned its pages. (For complete accuracy, we
* assume that no else is pinning the pages, but as a rough assertion
* that we will not run into problems later, this will do!)
*/
GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
}
/**
* i915_vma_insert - finds a slot for the vma in its address space
* @vma: the vma
@ -595,7 +607,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
obj->bind_count++;
spin_unlock(&dev_priv->mm.obj_lock);
GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
assert_bind_count(obj);
return 0;
@ -633,7 +645,7 @@ i915_vma_remove(struct i915_vma *vma)
* reaped by the shrinker.
*/
i915_gem_object_unpin_pages(obj);
GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
assert_bind_count(obj);
}
int __i915_vma_do_pin(struct i915_vma *vma,